Machine-gun.



A. V. P. M. BERTHIER.

MACHINE GUN. APPLICATION FILED JULY :0. 1912.

Lli ga Patented July 6, 1915.

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ANDRE VIRGILE PAUL MARIE BERTHIER, OF PARIS, FRANCE.

MACHINE-GUN.

Application filed July 10. 1912.

To all vr/mm it may concern lc it; known that l, Anmui Vinomn PAUL Manna Bi-xn'rumu, a citizen of the Republic of France. residing at 90 Rue de tlrenelle, Paris, in. the. French Republic, have invented certain new and useful lmprovcn'icnts in and Relating to hlachineliuns; and l hercby cclarethe following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to a gas 'iressure loading machine gun in. which the locking and unlocking are produced by the oscillation of a locking member.

The invention resides broadly in the fact that the locking member is rochably mount ed directly on the breech block itself, its rear end being raised or lowered when the breech block advances and retreats respectively.

An embodiment of the invention is illustrated in the accompanying drawing in which:

Figure 1 is a partial longitudinal section through the gun in the closed condition. Fig. 2 is a corresponding View in the open condition. Fig. 3 shows the breech closure in elevation. Fig. 4 is a horizontal longi tudinal section thereof, and Figs. 5 and (3 illustrate thefiring mechanism of the gun in two different positions.

Generally speaking the arrangement of this machine gun is known. The means for locking and unlocking the brec :h block are however, novel. In the machine gun described in my prior specification Ser. No.

M8013 the breech block is advanced and re tracted by the engagement of a nipple mounted on the gas pressure piston and ow ing to the sliding of the nipple in oblique grooves in the breech blocl; its rear end is raised and lowered at the proper time and thereby locked and unlocked.

In accordance with the present invention the breech block 1 is of frame-like formation and in it a special locking member 2 is arranged, the 'front rounded portion of which is inserted so as to constitute a joint :in a corresponding recess in the breech block and is provided with the known inclined groove 3 in which the nipple 4 of the pressure piston engages. The striker 5 is rigidly connected with the nipple. The operation of the gun generally speaking, fol- Specification of Letters Patent.

Patented July 6, 1915.

Serial No. 703,572.

lows the known. operation but with the difference that the breech block itseli etlects a rectilinear movement. In its forward movement the nipple t slides in the groove 3 in the locking member .2 and in the forward position of the breech closure lifts the rear end of this member to such a height that the projection G engages behind the shoulder 7 of the casing. V hen the breech block effects its return movement the operation is reversed. For the purpose of cocking the gun by hand the known coclv'ing device 8 adapted to be actuated from the exterior is provided (Fig. 2) its lever-like handle being in the present case adapted to be folded for the purpose of facilitating the arrangement of the gun in a case and it is automatically retained in each end position by the engagement of a spring 9 in a corresponding notch.

in order to permit o'l single and continuous tiring a projection 11 is provided on the trigger 10 of this gun and in the path of this projection a bolt pin 12 is rotatably mounted and can be actuated fronr the exterior by means of a pressure member. This pin is provided with a fiat or recess in the path of the projection 11. If the pin 12 is rotated in such a manner that its solid portion is opposite the projection 11 (Figs. 1 and 2) the gun is set for single firing, that is to say the trigger can only be pulled so far that the rear end of the rod 13 is released (F g. 5) so that its front projection is again able to oscillate into the position for retaining the gas pressure piston. If, however, the pin 12 is rotated into the position shown in Fig. ii the trigger can be pulled to such an extent that its rear end bears against the rear end oi the rod 13, presses the latter upward and thus holds its front engaging projection out of engagement so that firing can take place unintcrruptedly. To enable this to be accomplished the trigger 10 is formed with stepped surfaces ll, 15 and the lefthand end of the trigger rod 13 is formed with :1 depending nose 16 made integral therewith. The trigger rod has pivoted thereto at 17 a pawl .lSatormed with a small projection l which is pressed against a shoulder 20 ot' the trigger rod by a spring 21 which is interposed between the nose 16 and the pawl 18 as clearly shown in Figs. 5 and 6. By this arrangement the pawl 18 can yield in one direction so that the trigger 10 is capable of returning from the position shown in Fig. 5 into that shown in Figs. 1 or v trigger s v Figs. V irig'ger mechzr he of; "11. guard anti by means of a (lehle of ro hatabie acljustiuenz, a rod.

formed with a nose and provided VVlilJ a springssecl paw], and. a trigger having? a proje 'oii adapted io cooperate Wiih saio. pin and also having a pluraliiy of shopped surfaces ailapied i0 ooi'iperafie with said nose and pawl.

'2. in a, hreeclrloaaiin machine gun of 'fihe kind described the coml'iination o! a pin a formed with a cutaway portion, m ans for rotatably ad usiiiig said @111, a trigger rod formed with a depending nose at its rear end, a, pawl. pivoted to said trigger in. close proximity to said nose, 2, spring interposed between said nose and pawl, a pressure pison, a trigger formed with two stepped-suraccs and having a projection adapted to coo;' erai7e with said pin in such manner that when she trigger projection engages With ii a elm-away portion of the pin for continuous firing, one of the stepped surfaces encs and lifts the nose of the trigger 'rod so that the tri rod is hold in its disengaged position, while when the trigger projection engages with the other portion of the pin, the stepped surfaces by their combined e11- gagemeut with the spring-pressed pawh enable the rear end of the trigger rod to be released and the front end of the trigger rod to rooccupy i'bs engaged position relative'to said pressure piston. 3

In a, breech-loading machine gun of the kind described, the combination of a pin, a trigger formed with two-stepped surfaces and also with a projection adapted to cooperate with said pin, a trigger rod and a yielding pawl pivot-ed to said firigger rod and adapted to coiiperatc with said stepped surface In testimony whereof I have affixed my sigiia'nure, in presence of two Witnesses.

ANDRE VIRGILE PAUL MARIE BERTHEIER.

EViipesses:

IL G. JUOX'E, L. MIUMMENGER. 

